Experimental investigation of flow unsteadiness over four types of spiked-blunt body at Mach 2.2

Ruiqing Guan; Qihao Qin; Yifan WangJinglei Xu

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Experimental investigation of flow unsteadiness over four types of spiked-blunt body at Mach 2.2

机译：Experimental investigation of flow unsteadiness over four types of spiked-blunt body at Mach 2.2

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Flow unsteadiness over four types of spiked-blunt body are investigated through wind tunnel experiments at a freestream Mach number of 2.2 at 0° and 4° angle of attack. The flow pulsation is visualized with high spatiotemporal resolution schlieren and then the shock-related unsteadiness is investigated through proper orthogonal decomposition (POD) method. Firstly, two special states in the suppressed pulsation mode are observed, namely the phase of withhold and the phase of smash. Flow over the standard aerodome spike will continuously transform between the two states, which can be distinguished from the distinct flow structures. Spectral analysis of unsteady pressure measurement detected the dominant frequencies of 2.2 kHz and 3.2 kHz for pointed spike and standard aerodome spike, respectively, and POD analysis further finds that the signal originates from the periodic motion of the aftershock. The large-amplitude flow pulsation (amplitude 0.23D) in typical pulsation mode is transformed into the high-frequency small-amplitude pulsation (amplitude 0.09D) in the suppressed mode. In addition, it is found that the variation of angle of attack makes little influence on the dominant frequency. And it is hard to find the main frequency of double/inverse aerodome spike, which indicates that the flow unsteadiness of different aerodome cases is not the same.

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来源
《Aerospace science and technology》 |2023年第9期|108468.1-108468.16|共16页
作者
Ruiqing Guan; Qihao Qin; Yifan WangJinglei Xu;
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作者单位

State Key Laboratory of Mechanics and Control of Aeronautics and Astronautics Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China, AECC Aero-Engine Control System Institute, Wuxi 214063, China;

State Key Laboratory of Mechanics and Control of Aeronautics and Astronautics Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Spiked-blunt body; Flow pulsation; High-speed schlieren; Proper orthogonal decomposition; Spectral analysis;

Experimental investigation of flow unsteadiness over four types of spiked-blunt body at Mach 2.2

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